Registration Patents (Class 84/136)
Movable detector at edge (Class 84/137)
  • Automatic tracking apparatus
    Patent number: 4191084
    Abstract: An automatic tracking apparatus is provided for maintaining alignment of music rolls in player organs and player pianos using an improved, air pressure controlled, sensing and control device. More particularly this system incorporates an air pressure sensing device utilizing a piston/cam controlled pendulum to operate a pneumatic alignment device.
    Type: Grant
    Filed: November 22, 1978
    Date of Patent: March 4, 1980
    Inventor: Lee Von Gunten